Sorry for the noob question. TL DR is the title + how long will it take for the data to started getting corrupted?
Some back story: i’m “the media guy” for my workplace and I tend to keep all the RAW photos, videos, all the rest of it, on my own drives. Now that I’m moving to another branch office, I might not need the data to be accessed as frequently, so I’m planning to only put them in a 2 TB ext 2.5’ HDD that has been serving as the on site backup for those files in the first place for about 2 years, and may not touch it for a long time. The main copies are in an equally large ext SSD, which I intend to delete after I have completely moved office. I do have an off site backup.
It is likely that the files will be fine for years. But they may become corrupt tomorrow.
You need multiple copies, on different types of media. And check/migrate regularly.